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Asian Journal of Crop Science
eISSN: 2077-2041
pISSN: 1994-7879

Editor-in-Chief:  Arvind Singh Tomar
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Research Article
Correlations and Path Coefficients for Yield Related Traits in Soybean Progenies
Thi Thuy Hang Vu, Thi Tuyet Cham Le, Dinh Hoa Vu, Thanh Tuan Nguyen and Thi Ngoc
Background and Objective: Soybean breeding is striving to develop high yielding cultivars. Understanding of the association between yield and its components and the contribution of those yield components to yield is important to the breeding and selection process. This study sought to determine the correlations, the direct and indirect effects of yield components on grain yields in soybean progenies. Materials and Methods: Two soybean crosses at F6 and F7 generations were grown in field condition. The correlations and path coefficents of 8 measured traits, viz growth duration (days), plant height (cm), first pod insertion height (cm), ratio of first pod insertion height to plant height, total number of pods per plant, total number of seeds per plant, 100 seed weight (g) and grain yield per plant (g/plant) were computed. Results: There were consistencies of correlations across generations and higher direct and indirect effects in F6 than in F7. Most direct effects were in agreement with correlations, indicating true associations. Significant positive correlations (r) and highly positive direct effects on grain yield were observed for total number of pods (r = 0.406-0.928), total number of seeds (r = 0.434-0.939) and 100 seed weight (r = 0.361-0.626) across generations and crosses. Ratio of first pod insertion height to plant height had significant indirect effects on yield via component traits. Conclusion: The selection strategy could be applied in early generations for significant yield components. Besides pod and seed related traits, ratio of first pod insertion height to plant height should also be considered for selection.
Research Article
Effect of Ratooning on Growth and Nutritional Quality of Amaranthus (Amaranthus tricolor) in Alfisol South Western Nigeria
Ayeni Leye Samuel, Oyebamiji, Kehinde Johnson, Morakinyo-Fasipe Olutoye Temitope and Agbona Ademola Isaac
Background and Objective: Increase in human population that results in food scarcity and malnutrition necessitates the need to increase growing of vegetable that is early maturing with well ratooning capacity. This study aimed to examine the effect of ratooning on growth, yield and nutrient uptake of Amaranthus tricolor. Materials and Methods: Two field experiments were conducted in 2017 at 2 different locations in Okegun situated at Ondo and Adeyemi College of Education Ondo, Teaching and Research Farm Ondo, South Western Nigeria. The treatments were harvesting by uprooting the plant or total harvesting of the plant at once (1 time harvest), twice (2 times harvest) and thrice (3 times harvest). The treatments were arranged in Randomized Complete Block Designed (RCBD) with three replications. The mean data for the two experiments were generated and used to discuss the findings. Results: Relative to total harvest, 2 and 3 times harvests significantly increased (p<0.05) plant height, fresh weight, dry weight, number of leaves and moisture content. Compared to total harvesting, 3 times harvest of Amaranthus tricolor increased plant height, number of leaves, fresh weight, dry weight and moisture content. Three times harvests recorded highest K. Two times harvest had highest Ca, Mg, Na, N and P. One time harvest significantly (p<0.05) recorded the highest Mn, Fe, Cu and Zn. Relative to 1 time harvest, 2 times harvest recorded highest increase in crude protein and fat content of Amaranthus tricolor. Conclusion: This study reported that the 3 times harvest recorded the highest growth parameters while 2 times harvest recorded the highest nutritional value of Amaranth in this experiment.
Research Article
Planting Density Effects on Feed and Fibre Yield of Two Kenaf (Hibiscus cannabinus L.) Varieties in Malaysia
Masnira Mohammad Yusoff, Martini Mohammad Yusoff, Ridzwan Abd Halim, Mohd Rafii Mohd Yusop, MohdJani Saad and Wan Huda Dinie Wan Majid
Background and Objective: Kenaf (Hibiscus cannabinus L.) has been identified as a viable alternative crop to replace tobacco in Malaysian agriculture. Since 2001 V36 kenaf variety has long been planted and currently a new variety MHC123 is being evaluated. The study was conducted to determine the effects of planting density and harvesting age on yield and quality of MHC123 compared to V36 kenaf varieties. Methodology: The study was conducted at MARDI Serdang Selangor and planting was carried out on 4th-6th April, 2013. The treatments of planting density, harvest age and variety were arranged in a split-split plot design with 4 replications. Harvest age was set as the main plot, planting density as a sub plot and variety as a sub-sub plot. Data were analyzed using SAS software. Results: The MHC123 had higher (p<0.05) CP content (18%) at planting density of 666,700 plants ha1 while V36 with 20.6% CP at planting density of 500,000 plants ha1. The MHC123 and V36 varieties had lower ADF content at planting density of 666,700 plant ha1 (30.7 and 30.8%, respectively) compared to the other planting densities. Planting density of 444,400 plants ha1 produced the highest fibre production for MHC123 and V36 where both varieties were higher in dry matter yield, bast yield and core yield compared with other planting densities. Across both varieties, dry matter yield was highest (p<0.05) at the lowest planting density of 444,400 plants ha1 at 12.7 t ha1, followed by decreased dry matter yield of 11.5, 11.2 and 10.3 t ha1 for planting density of 500,000, 571,500 and 666 700 plants ha1, respectively. Conclusion: The MHC123 is superior to V36 variety in leaf yield, stem yield, leaf to stem ratio, leaf area index, number of days to flowering and bast yield. For kenaf forage production the suitable planting density for MHC123 variety is 666,700 plants ha1.
Research Article
Determination of Genetic Markers in Some Egyptian Varieties of Wheat and Barley under Salt and Drought Stresses
S.A.A. Heiba, A.A.A. Haiba and H.M. Abdel- Rahman
Background and Objective: Wheat and barley considered very important cereals for 100 millions of Egyptian population. Therefore, yield improving of some Egyptian varieties via genetic markers cereal crops under abiotic stresses drought and salinity is a crucial objective of this research. Materials and Methods: Five varieties of quadruple wheat were evaluated under salt stress and 14 varieties of barley were evaluated under drought stress to determine the genetic mechanisms related with molecular markers responsible for salinity tolerance in wheat and water deficit in barley. The techniques used were RAPD, ISSR and SSR-PCR, the obtained data of items studied were analyzed by molecular methods. Results: The results obtained from SSR revealed the presence of five molecular markers related to water stress tolerance in barley, three of which were positive for endurance and durability compared with control. While, RAPD-PCR revealed 3 markers which have 2 positive and one negative with primers OPE-26, E-10 and A-12, respectively. Furthermore, molecular studies of quadruple wheat for salt tolerance revealed the presence of 15 molecular markers from RAPD-PCR and ISSR techniques, six of which were positive with Beni-Sweif4, while Beni-Sweif1, 3 and Beni-Sweif5 had two positive markers for each of them. Conclusion: It could be concluded that RAPD, ISSR and SSR markers played vital and successful role to identify between all the genotypes used concerning salt stress in wheat and drought stress in barley, which could be helpful in the enhancement of cereals production in Egypt. This technology can be used as an indicator of molecular breeding in barley and wheat. This stage is the strategic bit for increasing the ability of abiotic stress tolerance of the studied lines and using it in local breeding programs.

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